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| 00:27:43 | rtr__ | Hi. What's the easiest way to pop first element from a sequence? |
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| 00:30:14 | cheatfate_ | rtr__, removing elements from sequence is not a good idea at all... |
| 00:30:55 | rtr__ | Inefficient? |
| 00:34:35 | cheatfate_ | yep |
| 00:37:31 | rtr__ | Ok. Thanks |
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| 00:48:19 | gokr | rtr__: I would say it all depends on what you are trying to do. Does it have to be the first? Using "pop" to get the last one is AFAICT not bad. |
| 00:50:29 | mcc | maybe consider constructing a different kind of data structure. |
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| 00:55:23 | gokr | rtr_: You can always use a queue - it uses a seq but has a read and a write position. Thus it handles removing the "first" element in a better way. |
| 00:56:16 | rtr_ | gokr: Oh. I'll try that. Thanks :) |
| 00:56:32 | gokr | No prob. |
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| 01:45:47 | vlad1777d | Do somebody knows how to open file with relative to .nim file or binary file path? (to define it relatively at compile time) |
| 01:56:28 | mcc | if nim does not offer this, the individual operating systems offer mechanisms for this |
| 02:03:47 | vlad1777d | mcc, thank you. In python I made transformation of current module's path + relative path and made: file = open(sys.path[0] + '/../../somedirectory/file2.txt') |
| 02:04:07 | vlad1777d | mcc, could you suggest me a way to do this in Nim? |
| 02:04:14 | mcc | vlad: yeah, you can do that because python explicitly offers such a thing. |
| 02:04:25 | mcc | python has an OS abstraction library. |
| 02:04:49 | mcc | vlad: however, it would be slightly tricky for nim to offer this. this is because nim compiles to a c++ program. |
| 02:05:17 | mcc | if you do not find the function listed in http://nim-lang.org/docs/lib.html , i would assume it does not exist. |
| 02:05:32 | vlad1777d | mcc, thank you |
| 02:06:35 | mcc | you could possibly set up your program to be executed indirectly through something like a shell or batch script, which sets the path before execution. |
| 02:09:06 | vlad1777d | mcc, thank you. I'll read about libraries where word "file" was reminded first, after I'll, maybe, try to bind Python and Nim. |
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| 02:12:56 | vlad1777d | maybe something will be in os module, which will allow for program to know it's path in runtime |
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| 02:22:46 | vlad1777d | mcc, thank you. I found. From os I take getAppFilename(), than by it's other functions, I get real file address and open it. |
| 02:23:18 | mcc | ah, great. and getAppDir. |
| 02:29:53 | vlad1777d | thanks very much =) |
| 02:30:00 | vlad1777d | good night |
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| 03:53:14 | perturbation | vlad1777d: look at the instantiationInfo proc (with fullPaths = true). It should return a tuple with the filename that you can use at compile time |
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| 07:35:58 | FromGitter | <gogolxdong> how to pull a PR? |
| 07:38:21 | FromGitter | <gogolxdong> I translated our java FFT into Nim, and I hope can merge into the complex module |
| 07:39:56 | Araq | fork Nim, push some commits |
| 07:40:05 | Araq | use the github website to create a PR |
| 07:40:22 | Araq | or some tool based on the github API |
| 07:42:32 | FromGitter | <gogolxdong> :) |
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| 08:46:50 | FromGitter | <gogolxdong> ''' ⏎ proc FFT*(dataSource:seq[float64]):seq[Complex]= ⏎ var N =len(dataSource) ⏎ result=newSeq[Complex](N) ⏎ for i in 0..N: ... [https://gitter.im/nim-lang/Nim?at=581704fa5a1cfa016e65e579] |
| 08:47:46 | FromGitter | <gogolxdong> ''' ⏎ proc FFT*(dataSource:seq[float64]):seq[Complex]= ⏎ var N =len(dataSource) ⏎ result=newSeq[Complex](N) ⏎ for i in 0..N: ... [https://gitter.im/nim-lang/Nim?at=5817053283a2008d22f01a8b] |
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| 09:07:24 | FromGitter | <gogolxdong> is implict convertion possible when integer multiply float? |
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| 09:12:57 | flyx | gogolxdong: is asking here faster than just testing it? |
| 09:13:36 | flyx | gogolxdong: but yes, integer implicitly converts to float in that case |
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| 09:27:39 | vlad1777d | Hello dear friends. In Python in loops I can use create variables and use them in non-nested level. I have no need to pass there variables. |
| 09:28:14 | vlad1777d | How do I export\import variables from loops to non-nested level ? |
| 09:28:18 | vlad1777d | Tell me please. |
| 09:28:32 | flyx | vlad1777d: you just declare them outside the loop |
| 09:29:13 | vlad1777d | flyx, can I change them inside the loop so, that they will be changed in non-nested level? |
| 09:29:17 | flyx | e.g. `var i = 0; for j in 1..10: i = j` and then use i afterwards |
| 09:29:39 | vlad1777d | Thank you |
| 09:29:59 | flyx | sure. since Nim uses explicit variable declarations, a usage of a variable is always bound to the scope it was declared |
| 09:30:57 | vlad1777d | As I understood, in nested levels I can see and change non-nested variables. But not vice versa. |
| 09:33:21 | flyx | if you declare a variable inside any block, it can be used until that block ends. so if you try to access that variable behind the block, you get a compile-time error because the variable doesn't exist there |
| 09:34:03 | flyx | this is the same concept as with most other statically typed languages. I understand you come from Python, have you used any other languages? |
| 09:35:00 | vlad1777d | Thank you very much =) I used only C on beginners level (made simple programs in university, made programs for brother, he received tasks at school) |
| 09:35:12 | vlad1777d | And Python on normal level. |
| 09:35:37 | vlad1777d | JavaScript at beginner-normal level =) |
| 09:35:41 | Araq | C has the same concept: |
| 09:35:52 | Araq | { int x; } use(x) // error |
| 09:36:18 | vlad1777d | I know it very-very badly, it was many years ago when I wrote there simple programs, but thank you =) |
| 09:39:33 | FromGitter | <gogolxdong> `fft.nim(7, 30) Error: type mismatch: got (float, int)` ` 7 result[n].re+=cos(-2*PI*i*n/N))*dataSource[n]` How does this happen? |
| 09:43:08 | flyx | gogolxdong: there are two closing paretheses |
| 09:43:40 | FromGitter | <gogolxdong> typos |
| 09:44:00 | FromGitter | <gogolxdong> sorry, still there |
| 09:45:07 | FromGitter | <gogolxdong> origin `7 result[n].re+=cos(-2*PI*float(i*n/N))*dataSource[n]` |
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| 09:46:31 | Araq | only int literals convert to flots, not int in general |
| 09:48:01 | flyx | Araq: that is not documented at http://nim-lang.org/docs/manual.html#type-relations-convertible-relation |
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| 10:04:47 | jh32 | hi |
| 10:06:02 | jh32 | hah, i found out why https://github.com/jfhg/nimdeep was so slow. |
| 10:06:39 | jh32 | linalg's DMatrix64 type is not a reference, so the matrices are copied around all the time |
| 10:06:57 | jh32 | changing it to ref object makes it super fast |
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| 10:10:15 | jh32 | well, let's say fast |
| 10:11:04 | Araq | okay ... ? |
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| 11:24:15 | FromGitter | <gogolxdong> the result of associating integers as `sin(-2*PI*float(i*n/N) )` is different from the one of splitting as `sin(-2*PI*i.float*n.float/N.float)` |
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| 11:30:17 | FromGitter | <gogolxdong> when result accumulates the sum result real part and image part |
| 11:34:02 | FromGitter | <Araq> sounds like floating point fun |
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| 11:51:17 | FromGitter | <gogolxdong> I remember you don't trust any thing come from floating poing |
| 11:52:05 | FromGitter | <gogolxdong> I remember you don't trust floating point |
| 11:56:56 | FromGitter | <gogolxdong> Is this common in C++ ,Go or some implement issues in Nim? |
| 11:58:56 | def- | gogolxdong: https://en.wikipedia.org/wiki/Floating_point#Accuracy_problems |
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| 12:09:15 | flyx | gogolxdong: well in your case, the difference is obvious, if you calculate (i*n/N) as int, you lose the remainder. if you calculate it as float, you don't |
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| 12:16:41 | FromGitter | <endragor> is it expected that comparing TableRef with ``nil`` segfaults in current devel? seems it calls `==` in tables module which doesn’t handle nils. previously it directly compared the reference with nil so it worked fine. |
| 12:16:56 | vlad1777d | Here is Slices paragraph: http://nim-lang.org/docs/tut1.html#advanced-types-enumerations is written: b[11..^2] = "useful" |
| 12:17:42 | vlad1777d | What does it mean? I read that if to count from end - you need to place minus sign ("-") |
| 12:18:32 | vlad1777d | Maybe it's a typo, or in Nim to count from the end of object we need to use sign "^"? |
| 12:23:28 | FromGitter | <gogolxdong> @flyx, that is the point,ty |
| 12:24:29 | FromGitter | <gogolxdong> but the splitting is not friendly as well. |
| 12:25:48 | flyx | endragor: `==` in tables module does handle nils: https://github.com/nim-lang/Nim/blob/devel/lib/pure/collections/tables.nim#L440 |
| 12:26:35 | Araq | vlad1777d: yes, ^ means "count from end" in Nim. |
| 12:26:37 | flyx | endragor: but yeah, there were some changes to `==` recently that may have caused this problem. |
| 12:27:19 | flyx | endragor: do you have a stacktrace? |
| 12:27:20 | FromGitter | <endragor> ah, it was `OrderedTableRef`, to be precise. it doesn’t handle nils, but comparing it with `nil` works fine in 0.15.2. |
| 12:27:43 | FromGitter | <endragor> but crashes on devel |
| 12:28:11 | vlad1777d | Araq, thank you, and can in Nim I use a[1..-3] as alias of a[1..^3], or it'll give error? |
| 12:28:51 | flyx | endragor: you're right, that's a bug and I am guilty. file an issue and mention me. |
| 12:29:12 | Araq | flyx: the other count table fix is also wrong iiirc |
| 12:29:19 | FromGitter | <gogolxdong> Is there a better way to write `sin(-2*PI*i.float*n.float/N.float)` |
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| 12:29:28 | flyx | Araq: I already suspected that |
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| 12:30:51 | FromGitter | <endragor> @flyx https://github.com/nim-lang/Nim/issues/4974 |
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| 13:10:42 | lg_ | trying to use writeBytes, but got Error: type mismatch: got (File, array[0..4095, uint8], Natural) but expected one of: proc writeBytes[](f: File; a: openArray[int8 | uint8]; start, len: Natural): int |
| 13:11:13 | lg_ | should not openArray[int8 | uint8] typematch my array[0..4095, uint8] ? |
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| 13:34:01 | flyx | can someone please test this on nim 0.15.2 / devel: `static: echo @[1] == @[1]` |
| 13:34:05 | flyx | I am stuck on 0.14.2 here |
| 13:34:27 | flyx | getting „VM is not allowed to 'cast'“ |
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| 13:49:27 | FromGitter | <qqtop> @flyx all ok on nim 0.15.2 dev. says true |
| 13:50:10 | flyx | qqtop: thanks. then I don't need to create an issue |
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| 13:54:14 | cheatfate_ | lg_, problem not in your array, but in `start` parameter |
| 13:54:34 | lg_ | oh! additional param .. thanks! |
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| 15:46:08 | libman | https://github.com/WebAssembly/design/issues/668 just got closed. |
| 15:46:20 | libman | Oops, wrong channel. |
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| 15:52:10 | FromGitter | <dom96> libman: That doesn't seem like a good reason to close an issue... |
| 15:52:53 | libman | Sorry, that link was meant for ##copyfree. Still philosophizing my Ivory Tower. :P |
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| 16:43:25 | Araq | dom96: maybe some people don't like to misuse their issue tracker as a wish list. |
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| 17:34:41 | dom96 | Araq: Maybe those people also would prefer making their repo private? :P |
| 17:40:50 | FromGitter | <Almynic> i'm trying to install nim on ubuntu but i can't add nim to the path somehow |
| 17:41:45 | Araq | you need to restart your terminal after messing with PATH |
| 17:42:49 | Calinou | or "source ~/.bashrc" |
| 17:42:52 | Calinou | that works too |
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| 20:14:33 | FromGitter | <Almynic> i can't install nimble on ubuntu via nim c install_nimble.nims can someone help? This is the error i get lib/pure/collections/queues.nim(69, 25) Error: value of type 'bool' has to be discarded ⏎ stack trace: (most recent call last) ⏎ lib/system/nimscript.nim(206) ⏎ lib/system/nimscript.nim(206, 7) Error: unhandled exception: FAILED: nim c nimble [https://gitter.im/nim-lang/Nim?at=5817a62983a2008d22f3fadb] |
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| 20:16:52 | FromGitter | <Almynic> koch nimble doesn't work either |
| 20:21:11 | Araq | almynic, PR for nimble is pending |
| 20:23:03 | libman | https://www.quora.com/What-is-the-most-portable-programming-language/answer/Alex-Libman-2 :P |
| 20:26:10 | Araq | ah new Nim cannot compile old Nim |
| 20:26:14 | Araq | hmm |
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| 20:28:22 | libman | Overzealous advocacy - it's a dirty job, but somebody's gotta do it. ;) |
| 20:29:09 | Araq | Error: invalid pragma: this: self |
| 20:29:27 | Araq | we should regenerated c sources some day |
| 20:29:33 | Araq | I like to use new features some day |
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| 20:55:23 | ldlework | so webassembly preview isi out |
| 20:55:32 | ldlework | with a toolchain to compile c to wasm |
| 21:00:59 | vlad1777d | Hello. Function proc trimZeros() from strutils module trims trailing zeros from a formatted floating point value (x). Modifies the passed value. Source: http://nim-lang.org/docs/strutils.html |
| 21:01:47 | vlad1777d | Is it the same as in Python's function the value, which will be modified, referenced as global, than was modified? |
| 21:02:50 | vlad1777d | As I understood, the main in Nim - where variable was referenced, it can be changed from any nested level. Is it so? |
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| 21:09:39 | Araq | vlad1777d: nested level or not doesn't affect whether you can write to it |
| 21:09:55 | Araq | and Python has no equivalent of 'var string' |
| 21:10:26 | vlad1777d | Araq, thanks |
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| 21:44:16 | vlad1777d | Is "\n" alias to "\l"? |
| 21:44:44 | dom96 | no |
| 21:44:47 | dom96 | OS dependent |
| 21:44:59 | vlad1777d | (I read some stackoverflow, but did not understood for Nim because here are character and string literals) |
| 21:45:01 | vlad1777d | thanks |
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| 22:09:34 | Araq | does git support branch name aliases? |
| 22:14:53 | corecode | maybe with hacks |
| 22:15:02 | corecode | HEAD is a ref that points to a ref |
| 22:15:13 | corecode | so maybe branches can do the same? but only locally |
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| 22:25:00 | Araq | no hacks please. |
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| 22:30:58 | reactormonk | Araq, depends if you consider symlinking them hacks. |
| 22:31:03 | vlad1777d | Can somebody please suggest me a way to convert sequence to tuple? (and\or to\from other types) |
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| 22:31:37 | vlad1777d | Where to look? |
| 22:33:03 | Araq | why would you want to? |
| 22:33:14 | Araq | if you don't know the length, how can it be a tuple? |
| 22:33:40 | vlad1777d | readFile returns sequence |
| 22:33:49 | vlad1777d | and I want it to be a tuple (named) |
| 22:33:59 | vlad1777d | I read settings from file |
| 22:34:11 | vlad1777d | sorry |
| 22:34:15 | vlad1777d | splitLines |
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| 22:41:19 | Araq | read dom96's book for how to accomplish that |
| 22:45:43 | vlad1777d | thanks, but I cannot bye it, it's not in my country, I cannot pay to amazon. I'll find solution for this after time. |
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